package edu.chalmers;

import java.util.ArrayList;

public interface BookManager {
	public int count();
	
	public Book bookAtIndex(int index);
	
	public Book createBook();
	
	public ArrayList<Book> allBooks();
	
	public void removeBook(Book b);
	
	public void moveBookAtIndex(int from, int to);
	
	public int minPrice();
	
	public int maxPrice();
	
	public float meanPrice();
	
	public int totalCost();
	
	public void saveChanges();
}
